The human reaction, simply preparing b4-b5 and mate.
11... d7c6 Taking with the queen is also possible. 12. c3e2 Here the pawn on a4 is quite useful, since the bishop cannot go to b5. It turns out that Black is in some danger in this position. Apart from the lack of development and the king in the center, there's a problem with the knight on f5, which isn't very stable. Black should always watch out for g2-g4. White's last move is very accurate, since he waits for the bishop to go to e7 before seriously considering g2-g4. Meanwhile, the knight's position is improved, since it can go to f4 and later h5 or d3. 12... f8e7  13. b2b3 Another subtle move. The path of the bishop is open to a3, and this will be quite useful. 13... e8c8 The king goes to the wrong side of the board. More than anything, this is a positional mistake: White's attack is simply much faster.